10 years

i say 20 years, just like internal combustion engine car in malaysia.

So much money is spent on the JENDELA, I doubt it will be phased out in ten years time.

we follow eu or UK before turn off 2G GSM

2G is used for USSD code
Backup network during disaster like east coast states big flood years back. Many telco tower down. TNB shutdown.

512158 is 2G MOCN nationwide

Before you talk when 4G phase out, you should talk when 5G SA kick in first